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材料导报  2021, Vol. 35 Issue (2): 2086-2091    https://doi.org/10.11896/cldb.19110077
  金属与金属基复合材料 |
工艺参数对脉冲等离子弧增材制造IN738LC合金组织与性能的影响
王凯博, 刘玉欣, 吕耀辉, 徐滨士
陆军装甲兵学院装备再制造技术国防科技重点实验室,北京 100072
Influence of Processing Parameters on Microstructure and Mechanical Property of Pulsed Plasma Arc Additive Manufactured IN738LC Superalloy
WANG Kaibo, LIU Yuxin, LYU Yaohui, XU Binshi
National Key Laboratory for Remanufacturing, Academy of Armored Force Engineering, Beijing 100072, China
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摘要 采用脉冲等离子弧增材制造技术在不锈钢基板上增材制造IN738LC合金试样。通过调整峰值电流、占空比、焊接速度等参数,研究相同热输入条件下,不同工艺参数对成形层组织与性能的影响。采用光学显微镜、扫描电镜、能谱分析、显微硬度测试等表征手段对成形层的晶粒形貌、析出相种类、尺寸及分布、力学性能进行了表征,同时结合凝固过程模拟讨论了稀释率对相析出行为的影响。结果表明,成形层组织主要有等轴枝晶、柱状枝晶和胞状枝晶,在枝晶间有大量颗粒状或短棒状碳化物;当稀释率较低时,组织中出现少量γ′相,显著提升了成形层的显微硬度。
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王凯博
刘玉欣
吕耀辉
徐滨士
关键词:  工艺参数  等离子弧  增材制造  稀释率    
Abstract: IN738LC superalloy was fabricated on stainless steel through plasma arc additive manufacturing technology. The effect of processing parameters on microstructure and mechanical property of as-built samples was studied by adjusting peak current, duty cycle and welding speed on the condition of maintaining the same heat input. Optical microscope, scanning electrical microscope, energy dispersive spectrum and microhardness measurements were carried out to analyse the grain structure, precipitations and mechanical properties. In addition, the simulation of solidification process was also performed to illustrate the mechanism of precipitating phases. Results show that microstructure of as-built samples mainly consists of equiaxial dendrites, columnar dendrites and cellular dendrites. There are many particle or needle carbides precipitating in the inter-dendritic regions. γ′ phases will precipitate under low dilution and enhance microhardness remarkably.
Key words:  processing parameters    plasma arc    additive manufacturing    dilution ratio
               出版日期:  2021-01-25      发布日期:  2021-01-28
ZTFLH:  TG456.2  
通讯作者:  yhlv127@163.com; lyxinbgd@163.com   
作者简介:  王凯博,2016年12月毕业于装甲兵工程学院,获得硕士学位。于2017年3月至今在陆军装甲兵学院再制造国防科技重点实验室攻读博士学位,主要从事镍基高温合金等离子弧增材制造技术的研究。
吕耀辉,陆军装甲兵学院再制造国防科技重点实验室,副研究员。2003年毕业于北京工业大学表面工程研究所,材料加工工程博士学位。主要从事变极性等离子焊接、等离子弧增材制造、过渡冷金属焊等研究工作。在国内外重要期刊发表文章50余篇,申报发明专利10余项。
刘玉欣,陆军装甲兵学院再制造国防科技重点实验室,副研究员。主要从事金属腐蚀与防护及装备再制造等研究工作。在国内外重要期刊发表文章50余篇,获国家发明专利10余项。
引用本文:    
王凯博, 刘玉欣, 吕耀辉, 徐滨士. 工艺参数对脉冲等离子弧增材制造IN738LC合金组织与性能的影响[J]. 材料导报, 2021, 35(2): 2086-2091.
WANG Kaibo, LIU Yuxin, LYU Yaohui, XU Binshi. Influence of Processing Parameters on Microstructure and Mechanical Property of Pulsed Plasma Arc Additive Manufactured IN738LC Superalloy. Materials Reports, 2021, 35(2): 2086-2091.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19110077  或          http://www.mater-rep.com/CN/Y2021/V35/I2/2086
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